Looked up somethings which may be relevant for Dune tracking
1. Canada made 11.5% of previews for Dune: Part 1, normally it is 8%. Conversly, US normally is 92% while for Dune 1 it was 88.5%. Dune 2 could have similar ratio, so your comps may be underindexing but if you are tracking some popular IMAX, it is possible you are overindexing.
2. Drafthouse overindexed for Dune 1, making around 2.25% of previews. For Oppy it was 1.8%, normally it is around 1.5%. @Inceptionzq
3. This is for @keysersoze123. MTC1 was 31% for Dune. For Oppy it was 30%. I suppose for Dune 2, could be around 31%+ as well. Actual gross was 95% of your tracked gross for Oppy.